| else one or a couple of the pistons in the caliper are sticking.
A warped disc tends to show up however hard you brake, but if it's slow speed only ie light braking, then it could be a piston or two.
There are no dust seals on them, and they aren't rebuildable, so take them off, remove the pads and give them a really good clean.
Forcing the pistons out a way without the pads fitted will give you more of the piston to clean to.
After you've done it, spray a little lube (WD40) or better still smear a little brembo brake grease around the piston and push them back in. | 
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